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An Experimental Study on Setting Characteristics of Geopolymer Paste, Optimization of Geopolymer Mortar and Microstructural Analysis to Correlate the Compressive Strength of Geopolymer Mortar


Author(s):

B S Girish , R V College of Architecture; Dr. H R Manjunath, R V College of Architecture

Keywords:

Geopolymer, Setting Time, Compressive Strength, Micro Structural Analysis

Abstract:

Consumption of cement as a major construction material is a global phenomenon. Cement manufacturing unit have been observed as one of the most imperative users of carbon based fuels that considerably contribute to greenhouse gas emissions. Hence there is a need to produce an essentially cement free binding material called Geopolymer. In the present research, an experimental study on setting characteristics of geopolymer paste, optimization of geopolymer mortar and microstructural analysis to correlate the compressive strength of geopolymer mortar wasstudied. The test results showed that initial and final setting time of Set1 and Set2 ranges from 15-320minutes and 40-640minutes respectively which was more than that of setting time of standard cement paste 65and 270minutes.This shows that increase in molarity makes the paste to set at a faster rate, whereas in increase of sodium silicate delays the setting time. The 28days compressive strength of Set1 and Set2 geopolymer specimens at ambient conditions was in the range 5.49-23MPa and 28days with one day oven curing was in the range 9.42-30MPa.Comparing the results of Set1 and Set2, 14M with activator ratio 1:2.5 gave the highest strength of 23MPa and 30MPa at ambient and oven curing conditions respectively. Geopolymer mortar at ambient conditions gave 10% less and oven cured samples gave 10% more strength than standard cement mortar. But there is still room for increase in strength as observed from microstructural analysis. From microstructural analysis, it was observed that the rate of reaction of geopolymer mortarincreases with the increase of NaOH concentration resulting in higher compressive strength and rate of reaction decreases with the increase of sodium silicatewhich results in lower compressive strength. The bonding at the age of 28 days (oven cured for 24 hours) samples was more when it was compared with 28 days ambient cured sample which indicates that the greater compressive strength. Also the bonding was more for the optimum activator ratio of 1:2.5 compared to all other activator ratios. Therefore the optimum dosage of alkali solution is 14M NaOH with activator ratio of 1:2.5. According to many literature papers the compressive strength gained in geopolymer mortar up to 28 daysis only around 75% – 80%, after 28 days there is possibility for improvement in the strength around 10% – 15 %.


Other Details:

Manuscript Id :IJSTEV7I12009
Published in :Volume : 7, Issue : 12
Publication Date: 01/07/2021
Page(s): 6-16
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